Lifting jack



jan. 23, 1923.

W. ROSENBERG ET AL. LlFTlNu JAcK FILED JAN. 12. 19 22.

2 SHEETS'SHEET I 2 SI- IEETSfSHEET 2 Jan. 23, 1923.

W. ROSENBERG ET AL. LIFTINO JACK FILED JAN. 12, I922.

Patented Jan. 23, 1923.

UNITE STATES Parent OFFICE.

WILLIAll I ROSENBERG ANDJOSEPH IVIOSS, OF ALLIANCE, OHIO, ASSIGNORS OF ONE- FOURTH TO JACOB SYDOR AND ONE-FOURTH TO JOSEPH SPIEGEL, BOTH OF ALLL ANCE, OHIO.

LIF'IING JACK.

Application filed January 12, 1922. Serial No. 528,780.

To (@ZZ whom it may concern:

Be it known that we, WILLIAM ROSENBERG and Jcsnrrr Moss, citizens of the United States, residing at- Alliance, in the county of Stark, State of Ohio, have invented a new and useful Lifting Jack, of which the following is a specification.

This invention relates to lifting jacks, the primary object of the invention being to provide a. lifting ack including telescoping sections, whereby the eel: may be extended to meet various requirements of usage.

Another object of the invention is to provide operating means for moving thesections to the upper portion of the base, novel means being provided for automatically extending the sections.

A still further object of the invention is the provision of locking means adapted to automatically loclrthe sections'in their ere tended positions, to eliminate any possibility of the weight supported by the jack, moving the sections to their inactive positions.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed, may be made within the scope ofwhat is claimed, without departing from the spirit of the invention.

eferring to the drawings Figure 1 is a front elevational view of a jack constructed in accordance with the present invention and disclosing a portion of.

the base as broken away to illustrate the jack adjusting rack.

Figure 2 is an enlarged detail view, a portion of the base being broken away to illustrate the gear and rack associated therewith.

Figure 3 is a sectional view taken on line 33 of Figure 1.

Figure 4; is a longitudinal sectional view through the ack disclosing the several sections as extended.

Figure 5 is an enlarged detail view of the jack operating means.

Figure 6 is a sectional view taken on line 6-6 of Figure 5.

Referring to the drawings in detail, the reference character 5 designates the base or support for the eel; proper and includes a relatively long member formed with inwardly extending flanges 6 disposed along the side edges thereof, the flanges overlying a portion of the base.

Formed substantially intermediate the width of the base and extending throughout the length thereof is a rack bar 7, the teeth 8 extending upwardly as clearly shown by Figure 1 of the drawings. v

These teeth are slightly inclined, as shown by F lgure 2, so that the same will properly mesh with the teeth 9 of the gear 10 which is secured at one end of the shaft 11, whereby movement of the gear 10 will cause the body port on 12 of the jack, to be hereinafter more fully described, to move along the base 5 to adjust the jack proper, and move the same to a proper lifting position, under the article to be lifted.

The body portion 12 is formed with lateral extensions 13 adapted to be fitted under the flanges 6, so that the body portion may be securely held to the base, but permitted to move freely thereover. Formed in the body portion 12 is a cut out portion 14 adapted to accommodate the rack bar 7 and permit the body portion to move thereover. I As shown more clearly by Figure 4 of the drawings, the body portion of the jack is hollow to permit the sections to telescope therein, thereby providing a ack which will consume comparatively little space in storing, and one which may be extended an appreciable distance-when employed forliftmg purposes.

Secured to the body portion 12 isa housing 15 in which. operates the gear 16 that is in mesh with the teeth 17 of the section 18 for moving the sections of the jack to their active or inactive positions. Associated with the gear 16 is a gear 19, the teeth of which being in mesh with the worm gear 20 formed on the operating shaft 21. Thus. it will be seen that as the operating shaft 21 is operated, the worm gear moves the gear 19, which in turn operates the gear 16 to move the jack sections.

Supported within the section 18, and constructed to move therein, is a section 22, which is also formed with rack bars 23 disposed in spaced relation with each other and positioned to be engaged by the gear 16 of the operating mechanism. Operating within the section 22 is a section 24 which is also designed to telescope within the section 22 and as shown, this section is formed with rack bars 25 disposed in spaced relation and constructed to cooperate with the gear 16.

Each of the sections 22 and 24 carries a locking means, each locking means including a pivoted bar 26 having connection with pins 27 at the opposite ends thereof, the pins 27 passing through suitable openings on the section supporting the same, so that the free ends thereof will extend between the teeth of the sections.

The sections 18 and 22 are formed with notched portions 28, which accommodate the bar 26 associated. therewith when the sections u iiporting the 5211110 are moved to positions to bring the bars int-o registry with the notched portions to lock the sections in their extended positions. It will be seen that since the pins 27 extend to points between the teeth of the rack bars of. the scctim s. the pins will be engaged by the gear 16, to the end that the bars will be forced into the notches upon one movement of the jack, but

upon the reverse movement of the jack, it.

is obvious that the pins will be moved to disengage the bars from their notches. I

In order that the sections will be restricted in their upward movement, spring pressed pins 29 are supported by the sections, which pins are adapted to move within the notches 30 of the adjacent section.

The operation of the device is as follows:

Assuming that the sections are in their telescoped positions within the body portion 12, it is obvious that when the shaft 20 is operated to rotate the gear 16, the uppermost section 24 will move from its telescoped position. When the section 24!; moves to the limit of its upward movement within the sec tion 22, the teeth of the gear 16 contact with the pins of the locking element to extend a portion of the bar 26 supported thereby within the notch associated therewith to lock the section 24 in its extended position. It follows that upon further rotation of the gear 16, the section 22 is extended and the operation of the locking element carried thereby takes place to lock this section in its extended position.

Upon the reverse movement of the gear 16 the locking members are again operated to permit the sections to telescope within the body portion 12.

It might be further stated that if the jack has been positioned under an article to be lifted, and it is found that the jack should be moved slightly to insure the jack operating with facility, it is only necessary to operate the shaft 11, to move the body portion of the jack along the base to a proper lo cation.

Having thus described the invention, what is claimed as new is 1. In a lifting jack, a base, inwardly extending flanges formed on the base, a rack bar carried by the base, a body portion having lateral extensions positioned under the flanges and supported on the base, means carried by the body portion and cooperating with the rack for moving the body portion longitudinally of the rack, and telescoping sections carried by the body portion.

2. In a lifting jack, a base, a hollow body portion adjustably supported on the base, telescoping sections supported by the body portion, rack bars carried by the sections. locking members including bars, the bar of one section adapted to move into engagement with the walls of a notch of the adjacent sec tion, pins carried by the bars, said pins lying between the teeth of the rack bars, a gear wheel adapted to move over the rack bars and contact with the pins for moving the locking bars to their locking positions, and means for restricting the upward movement of the section.

3. In a lifting jack, a base. a body portion supported on the base. means for adjusting the body portion with respect to the base, a plurality of telescoping sections supported within the body portion, means for mo'vin the sections to their extended positions, means for locking the sections to the extended positions, and sliding pins cooperat ing with the sections for restricting upward movement of the sections.

In testimony that we claim the foregoing as our own, we have hereto affixed our sign atures in the presence of two witnesses.

\VIIJLIA M R0 SENB Eli (l. JOSEPH MOSS.

Witnesses:

RUTH I. GASKILL, A. L. BAKER. 

